著者

平康 博章 因野 要一 西村 和彦

出版者

低温生物工学会

雑誌

低温生物工学会誌 (ISSN:13407902)

巻号頁・発行日

vol.60, no.2, pp.73-77, 2014-10-15 (Released:2017-06-15)

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Pulse combustion drying was used for dry preservation of lactic acid bacteria. An antioxidant i.e., 0.01% ascorbic acid or 1.0% glutathione was added to skimmed milk (5%) and trehalose (5%) to protect against desiccation of bacterial cells. The survival rate of dried lactic acid bacteria was > 90% on addition of the antioxidants, while addition of only skimmed milk and trehalose resulted in a 27% survival rate. Neither oxidized ascorbic acid nor glycine demonstrated this effect. Therefore, addition of an antioxidant to prevent peroxidation of the lipid membrane of microorganisms is effective in maintaining the viability of lactic acid bacteria subjected to pulse combustion drying. This the first study to achieve a sufficiently high survival rate of lactic acid bacteria in order to develop a microbiological agent using pulse combustion dryer.

著者

森村 勉 関 雅樹 石川 栄 坂上 啓 三輪 昌弘 村松 浩成 西村 和彦 吉田 幸司 足立 昌仁 南 善徳

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 = Transactions of the Japan Society of Mechanical Engineers. C (ISSN:03875024)

巻号頁・発行日

vol.76, no.764, pp.825-834, 2010-04-25

参考文献数

12

被引用文献数

1

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We conducted full scale experiment to study the derailment mechanism of high speed railway vehicle by earthquake ground motion. The experiment was arranged to mimic the vehicle/track conditions of Tokaido Shinkansen by using the bolsterless bogie and the track materials both presently in use for Tokaido Shinkansen. Large excitations enough to derail the test vehicle were given, so that derailment motions were fully captured. Through the tests, (1) Total 34 cases of derailment were observed by the sine wave excitations in the frequency ranges of 1.1Hz to 1.5Hz. The test vehicle was derailed as the result of rocking motion. (2) Wheel lifts of around flange height without derailment were observed by the sine wave excitations in the frequency ranges of 0.5Hz to 1.0Hz. (3) By comparing the vehicle motions of two cases of different ballast conditions, we learned that dynamic features of the ballast track brings no significant difference on the vehicle dynamics of those cases. (4) Finding reasonable match between the experimental results and analytical results obtained from the simulation developed by the authors, we further investigated the possibility of derailment by the sine wave excitations in the frequency ranges of 0.5Hz to 1.0Hz and found that vehicle was to be derailed by giving larger excitation amplitudes than those given in the experiment.